Reference for Bava Metzia 43:1

וכן ירדן שנטל מזה ונתן לזה מה שנטל נטל ומה שנתן נתן

or if the Jordan<span class="x" onmousemove="('comment',' Or any other river which carries away goods and lands them somewhere else. ');">¹</span> takes from one and gives to another, then what has been taken is taken, and what has been given is given.<span class="x" onmousemove="('comment',' The recipient has a right to keep the goods. Cf. B.K., 114a. ');">²</span>

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